Method and system for scrambling broadcast with low latency

A file-based low-latency broadcast scrambling system comprising:

• a file data input unit;
• an encryption application policy determination unit;
• a header box modification unit;
• an encryption key generation unit;
• an encryption unit;
• and
• a file data output unit,
• wherein the file data input unit is configured to receive a broadcast file to be encrypted and deliver the broadcast file to a header box modification unit,
• wherein the encryption application policy determination unit is configured to deliver encryption application policy information of the broadcast file to the header box modification unit, the encryption key generation unit, and the encryption unit,
• wherein the header box modification unit is configured to modify information that should be change due to encryption corresponding to an encryption application policy among information included in a header box included in the broadcast file, configured to add an encryption application parameter generated according to the encryption application policy to the header box, and configured to immediately deliver the header box to the encryption unit,
• wherein the encryption key generation unit is configured to generate an encryption key and deliver the generated encryption key and an encryption key identifier to the encryption unit and the encryption application policy determination unit, and
• wherein the encryption unit is configured to encrypt a broadcast file by means of the encryption key and the encryption key identifier, and
• wherein the file data output unit is configured to output the encrypted broadcast file.